CN108729480B

CN108729480B - Dragline bucket

Info

Publication number: CN108729480B
Application number: CN201810332523.4A
Authority: CN
Inventors: M·R·斯托尔兹
Original assignee: Caterpillar Inc
Current assignee: Caterpillar Inc
Priority date: 2017-04-21
Filing date: 2018-04-13
Publication date: 2023-01-31
Anticipated expiration: 2038-04-13
Also published as: US20180305891A1; USRE48978E1; AU2018202321B2; CN108729480A; US10544562B2; AU2018202321A1

Abstract

The dragline bucket includes a base member, a first side member extending from the base member and including a first upper edge, a second side member extending from the base member and a rear member extending from the base member and including a second upper edge, a mouth for receiving material into the bucket, and a first sloped wall extending from the first side member to form a first compound angle with the base member and a second sloped wall extending from the rear member and adjacent the first sloped wall to form a second compound angle with the base member.

Description

Dragline bucket

Technical Field

The present invention relates to a bucket and rigging assembly for use in dragline mining operations and the like. More particularly, the present invention relates to a dragline bucket assembly that includes a sloped wall near the rear of the bucket assembly.

Background

Referring first to fig. 1, bucket assembly 100 has traditionally been used with a rigging assembly 102 that uses a lower brace 104 positioned above a rear attachment point 106 of bucket assembly 100 (typically providing a trunnion-type connection with a trunnion link) to help hold a hoist chain 108 (from which bucket assembly 100 is suspended) in contact with an edge 110 of a wall, such as a side wall 112 of bucket assembly 100, during use, such as during loading of material into or dumping out of a bucket 114. If such contact or friction occurs while the chain 116 (shown attached via a U-shaped link) moves the bucket, the chain 108 may wear out over time and need to be replaced, requiring shutdown maintenance that may result in lost benefits to the mining operation, etc. Moreover, the brace 104 helps position the chain 108 so that the chain does not inhibit the filling of the bucket 114 or the dumping of the bucket 114.

However, such braces 104 are very heavy, placing loads on the hoist chain 108 and the machine (not shown) using bucket assembly 100, and may wear themselves. This also results in the need for maintenance. Moreover, the machine also has to exert more energy, resulting in higher operating costs for mining operations and the like. In addition, the weight of the brace 104 limits the capacity of the bucket 114, thereby affecting the efficiency of the mining operation.

Accordingly, various designs have been developed to eliminate the need for the lower brace 104. Once such a design is included that changes the geometry of the rear of the bucket 114, such as angling, tilting, or angling the side walls 112 near the rear of the bucket 114 as needed to reduce the risk of the chain 108 at the rear attachment point 106 of the bucket 114 rubbing against the edge 110 of the bucket 114. However, these buckets 114 tend to be long, making them less efficient than desired when loading the buckets 114 with material in use (e.g., they may take longer to fill or empty the buckets). Also, the placement of the attachment points 106 does not maintain the balance of the bucket 114 when the material is loaded into the bucket in a desired manner. Another design has placed the attachment points 106 or trunnions inside the bucket 114, but this tends to limit or interfere with the loading or dumping of material into the bucket 114. In other cases, the trunnions are placed on the back wall, but this may not be ideal in maintaining the balance of the bucket as material is loaded into the bucket.

Accordingly, there is a need to develop a better design for a dragline bucket (than has been designed) to help eliminate the need for a brace in a rigging assembly.

Disclosure of Invention

A dragline bucket in accordance with an embodiment of the present invention includes a base member, a first side member extending from the base member and including a first upper edge, a second side member extending from the base member in an opposite manner from the first side member to define a distance from the first side member to the second side member, and a rear member extending from the base member and including a second upper edge. The first side member, the second side member, and the base member define a mouth for receiving material into the bucket, and a first sloped wall extends from the first side member and a second sloped wall extends from the rear member adjacent the first sloped wall. The first angled wall forms a first compound angle with the base member and the second angled wall forms a second compound angle with the base member that is different from the first compound angle.

A dragline bucket in accordance with an embodiment of the present invention includes a base member, a first side member extending from the base member and including a first upper edge, a second side member extending from the base member in an opposite manner from the first side member to define a distance from the first side member to the second side member, and a rear member extending from the base member and including a second upper edge. The first side member, the second side member, and the base member define a mouth for receiving material into the bucket, and a first sloped wall extends from the first side member, a first miter wall extends from the first side member and is adjacent to the first sloped wall, the first sloped wall forms a first compound angle with the base member, and the first miter wall forms a lower obtuse angle with the first side member.

A dragline bucket in accordance with an embodiment of the present invention includes a base member, a first side member extending from the base member and including a first upper edge, a second side member extending from the base member in an opposite manner from the first side member to define a distance from the first side member to the second side member, and a rear member extending from the base member and including a second upper edge. The first side member, the second side member, and the base member define a mouth for receiving material into the bucket, the rear member defines a rear interior end of the bucket, and the bucket defines a fill direction and a center of gravity and a cartesian coordinate system including an X-axis, a Y-axis, a Z-axis, and an origin positioned at the center of gravity, wherein the X-axis is aligned with the fill direction of the bucket, the bucket further defining a fill depth measured parallel to the X-axis from the mouth to the rear interior end of the rear member. The first trunnion attachment structure is attached to the bucket along the X-axis a first predetermined distance from the rear inner extremity, and a ratio of the first predetermined distance to the fill depth is 15% to 45%.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate several embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings:

fig. 1 is a perspective view of a dragline bucket suspended using a hoist chain attached to a lower strut in a rigging assembly known in the art.

FIG. 2 is a perspective view of a bucket assembly according to an embodiment of the present disclosure, which includes a plurality of slanted or mitered walls near a rear of the bucket assembly.

FIG. 3 is a front view of the bucket assembly of FIG. 2.

FIG. 4 is a side view of the bucket assembly of FIG. 2.

FIG. 5 is a top view of the bucket assembly of FIG. 2.

FIG. 6 is a bottom view of the bucket assembly of FIG. 2.

FIG. 7 is a rear view of the bucket assembly of FIG. 2.

FIG. 8 is a top cross-sectional view of one half of the bucket assembly of FIG. 4, the cross-section being taken along the horizontal plane of the pin slot.

Fig. 9-12 are perspective views of trunnion attachment structures used as part of the rear attachment points of the bucket assembly of fig. 2-8.

FIG. 13 is an enlarged cross-sectional view of the trunnion attachment structure shown in FIG. 8, taken at a lower level than the cross-section of FIG. 8.

Fig. 14 is an enlarged view of the trunnion attachment structure shown in fig. 4.

FIG. 15 shows the bucket assembly of FIG. 2 used with a rigging assembly lacking a lower brace.

FIG. 16 is a rear cross-sectional view of the bucket and rigging assembly of FIG. 15, wherein the bucket and rigging assembly is cut in half along a midplane of the assembly.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. In some cases, reference numbers will be shown in the specification, and the drawings will show reference numbers accompanied by letters, e.g., 100a, 100b, or apostrophes, e.g., 100', 100", etc. It should be understood that the use of letters or apostrophes directly after reference numerals indicate that these features are similarly shaped and have similar functions, as is often the case when the geometry is mirrored about a plane of symmetry. For ease of explanation in this specification, letters or apostrophes are often not included herein, but may be shown in the drawings to show copies of features having similar or identical functions or geometries (discussed in this written description).

In various embodiments, a bucket assembly or bucket is provided that uses multiple inclined walls (which reduces the likelihood of the hoist chain rubbing against the edge of the bucket), while also reducing the likelihood of a gap forming at the rear of the bucket when the bucket is loaded with material. In other embodiments, a bucket assembly or bucket is provided that uses sloped walls to reduce the likelihood of hoist chain rubbing against the edge of the bucket, and a sloped wall (where trunnion attachment structures are provided) located below the sloped walls to help protect the trunnion attachment structures from wear as material passes over the trunnion attachment structures when loading the bucket. In still other embodiments, the trunnion attachment structure is positioned offset from the back wall and offset from the center of gravity by an appropriate distance to maintain a desired balance when filling the bucket with material.

Referring now to fig. 2-8, a bucket assembly 200 according to an embodiment of the present disclosure will now be described that may allow for the removal of the lower brace while also improving the ability to fill the rear of the bucket 202. Bucket assembly 200 may include a bucket 202, where bucket 202 includes a base member 204, a first member 206 extending from base member 204 including a first upper edge 208, a second side member 206 'extending from base member 204 in a manner opposite first side member 206 to define a distance D206 from first side member 206 to second side member 206', and a rear member 210 extending from base member 204 including a second upper edge 212. The first side member 206, the second side member 206', and the base member 204 define a front ring or mouth 214 for receiving material entering the bucket 202. For this embodiment, first and second side members 206, 206' extend out in front of mouth 214, defining a forward facing protrusion 216 (sometimes referred to as a drag lug) that provides a prong pin compatible attachment point 218 and an arch 220 (which extends out from the forwardmost portion of upper edges 208, 208' of first and second side members 206, 206 '). Two arch attachment points 224 are provided at the top of the arch 220. Other configurations for the first and second side members are also possible. Also, the arch may be omitted or a bail or the like may be provided.

The front edge of the base member 204 is covered or protected by various means, such as a curb 222 (sometimes referred to as a shroud) and a ground engaging tool 225. Ground engaging tool 225 is attached to the front edge using tool adapter 226. In other embodiments, a continuous bead or bottom edge may be attached to the front edge of the base member 204. In still other embodiments, any form of leading edge protection may be omitted.

Looking toward the rear of the bucket 202, a first sloped wall 228 may extend from the first side member 206, and a second sloped wall 230 may extend from the rear member 210 proximate the first sloped wall 228. The first angled wall 228 forms a first compound angle α 1 (best shown in FIG. 7) with the base member 204, and the second angled wall 230 forms a second compound angle α 2 (best shown in FIG. 7) with the base member 204 that is different from the first compound angle α 1. The angular change between the first compound angle α 1 and the second compound angle α 2 allows the bucket to transition from the first side member 206 to the rear member 210 while also providing a first function for the first sloped wall 228 and a second function for the second sloped wall 230. The first function of the first inclined wall 228 is to reduce the likelihood of the hoist chain rubbing against the upper edge 208 of the bucket 202, while the function of the second inclined wall 230 is to reduce the likelihood of voids as material fills into corner voids at the rear of the bucket 202.

More specifically, the first angled wall 228 includes a third upper edge 232 connected to the first upper edge 208 of the first side member 206, and the second angled wall 230 includes a fourth upper edge 234 connected to the second upper edge 212 of the rear member 210. Also, the first angled wall 228 may be connected to the second angled wall 230 such that the third upper edge 232 of the first angled wall 228 is directly connected to the fourth upper edge 234 of the second angled wall 230. At least a portion of the back member 210 forms a third angle β (best shown in fig. 4) with the base member 204. The angles of the rear member, the first angled wall and the second angled wall allow these parts of the bucket to hang over the interior of the bucket, making it less likely that material will fall out of the bucket as it is loaded into the bucket.

Bucket 202 defines a loading direction F and a center of gravity C, and a cartesian coordinate system including an X-axis, a Y-axis, a Z-axis, and an origin O positioned at center of gravity C. As shown in fig. 2-8, the X-axis is aligned with the fill direction F of bucket 202, and first compound angle α 1 includes a first component angle γ 1 (best shown in fig. 4) projected onto the X-Z plane along the Y-axis and a second component angle γ 2 (best shown in fig. 3) projected onto the Y-Z plane along the X-axis, and the first component angle γ 1 is 50 to 85 degrees and the second component angle γ 2 is 50 to 80 degrees.

Similarly, the second compound angle α 2 includes a third component angle θ 1 (best shown in FIG. 4) projected onto the X-Z plane along the Y-axis and a fourth component angle θ 2 (best shown in FIG. 3) projected onto the Y-Z plane along the X-axis, and the third component angle θ 1 is 60 to 80 degrees and the fourth component angle θ 2 is 50 to 85 degrees. Also, a third angle β (best shown in FIG. 4) formed by the rear member 210 and the base member 204, as projected along the Y-axis onto the X-Z plane, is 60 to 80 degrees, and in some embodiments may be about 70 degrees.

With continued reference to fig. 2-8, a bucket assembly 200' according to an embodiment of the present disclosure will now be described that may allow for removal of the lower brace while also protecting the aft trunnion attachment structure 236 of the bucket. The bucket 202 'may include a base member 204, a first member 206 extending from the base member 204 including a first upper edge 208, a second side member 206 extending from the base member 204 in a manner opposite the first side member 206 to define a distance D206 from the first side member 206 to the second side member 206', and a rear member 210 extending from the base member 204 as previously described including a second upper edge 212. Moreover, the first side member 206, the second side member 206', and the base member 204 define a mouth 214 for receiving material into the bucket 202.

A first angled wall 228 extends from the first side member 206, a first miter wall 238 extends from the first side member 206 proximate the first angled wall 228, the first angled wall 228 forms a first compound angle α 1 with the base member 204, and the first miter wall 238 forms a lower obtuse angle with the first side member 206

(best shown in fig. 8). Aft trunnion attachment structure 236 extends at least partially from first miter wall 238.

As previously mentioned, the bucket defines a loading direction F and a center of gravity C, and a cartesian coordinate system including an X-axis, a Y-axis, a Z-axis, and an origin O positioned at the center of gravity C. The X-axis is aligned with the fill direction F of bucket 202', and first compound angle α 1 includes a first component angle γ 1 (best shown in fig. 4) projected onto the X-Z plane along the Y-axis and a second component angle γ 2 (best shown in fig. 3) projected onto the Y-Z plane along the X-axis, and the first component angle γ 1 is 50 to 85 degrees and the second component angle γ 2 is 60 to 80 degrees. Lower obtuse angle

(best shown in FIG. 8) is projected onto the X-Y plane along the Z-axis and at a lower obtuse angle

From 150 to 170 degrees and in some embodiments may be about 160 degrees.

Bucket 202' can further include a second sloped wall 230 connecting first sloped wall 228 to rear member 210 and a second sloped wall 240 connecting first sloped wall 238 to rear member 210. As best shown in fig. 14, the first angled wall 228, the second angled wall 230, the first miter wall 238, and the second miter wall 240 may all be positioned directly adjacent to each other, forming a four-way intersection 242. Further, a transition wall 244 (such as a radius) may be used to connect the second sloped wall 230 and the second miter wall 240 to the rear member 210. The transition wall 244 may continue from the rear to the bottom of the bucket 202', thereby coordinating the first miter wall 238 and the first side member 206 to the base member. Ribs 246 may be provided on the bottom of the base member 204 and the bottom transition wall 244. The bucket may be symmetrical about the X-Z plane. The third and fourth

upper edges

232, 234 may be coplanar with the second upper edge 212.

As can be appreciated with reference to fig. 8, another lower obtuse angle (not specifically noted) may be formed between second miter wall 240 and rear member 210, which is 130 to 150 degrees, and in some embodiments may be about 140 degrees, projected along the Z-axis into the X-Y plane. The second mitered wall can also be used to help prevent the formation of voids in the rear corner of the bucket when filling. The side members and the rear member may be substantially perpendicular to each other.

Next, referring back to fig. 2-8, a bucket assembly 200 "according to an embodiment of the present invention will now be described that provides good balance when the bucket 202" is filled. Bucket 200 "includes a base member 204, a first side member 206 extending from base member 204 and including a first upper edge 208, a second side member 206 'extending from base member 204 in a manner opposite first side member 206 to define a distance D206 from first side member 206 to second side member 206', and a rear member 210 extending from base member 204 and including a second upper edge 212.

As shown in fig. 8, the first side member 206, the second side member 206', and the base member 204 define a mouth 214 for receiving material into the bucket 202 ". The rear member 210 defines a rear interior end 248 of the bucket, and the bucket 202 "defines a fill direction F and a center of gravity C, and a cartesian coordinate system including an X-axis, a Y-axis, a Z-axis, and an origin O positioned at the center of gravity C. The X-axis is aligned with a fill direction F of the bucket 202", and the bucket further includes a fill depth 250 measured parallel to the X-axis from the mouth 214 to the rear interior end 248 of the rear member 210. The first trunnion attachment structure 236 is attached to the bucket 202 "a first predetermined distance 252 from the rear inner end 248 (measured from the pin bore 260 of 236), and the ratio of the first predetermined distance 252 to the fill depth 250 is 15% to 45%, and in some embodiments may be about 35%.

Likewise, the center of gravity is positioned a second predetermined distance 254 from the mouth 214 along the X-axis, and the ratio of the second predetermined distance 254 to the fill depth 250 is 15% to 35%, and in some embodiments may be about 20%. The X-Z plane defines a mid-plane 256 (and sometimes a plane of symmetry), and the trunnion attachment structure 236 defines a trunnion slot 258 having a longitudinal axis L258 that is parallel to the X-Z plane.

As previously described with reference to fig. 2-8, first inclined wall 228 extends from first side member 206 toward rear member 210, and first trunnion attachment structure 236 is disposed below first inclined wall 228 in a direction parallel to the Z-axis. A first miter wall 238 extends from first side member 206 toward rear member 210, first miter wall 238 is connected to first miter wall 228, and first trunnion attachment structure 236 is disposed on first miter wall 238.

Further, as shown in fig. 4, the second inclined wall 230 extends from the first inclined wall 228 to the rear member 210. The first angled wall 228 includes an upper obtuse angle with the first upper edge 208 of the first side member 206

A third upper edge 232 at an obtuse angle

Projected along the Y-axis onto the X-Z plane.Upper obtuse angle

May be 160 to 180 degrees and may be about 170 degrees.

Turning now to fig. 8 and 9-14, the construction and use of the trunnion attachment structure 236 will now be described in more detail. Trunnion attachment structure 236 includes an attachment plate or base plate 262 that is predominantly flat so that it can be attached to first miter wall 238. However, the bottom 264 of the base 262 may be curved to match the transition wall 244. The trunnion attachment structure 236 shown is particularly well suited for casting. The rear side of trunnion attachment structure 236 can be hollowed out or hollowed out (see reference numeral 266), and a spacer 268 can extend from base plate 262.

The spacer 268 defines a trunnion slot and a pin hole extends orthogonal to the trunnion slot 258 for receiving a pin 270 (shown obscured in fig. 15 and 16), which pin 270 retains a trunnion link 272 (shown obscured in fig. 15 and 16) in the slot 258 in a manner known in the art. An elongated entry hole 274 is also provided so that pin 270, which is used to hold trunnion link 272 in place, can be accessed to attach trunnion link 272 and remove trunnion link 272 from trunnion attachment structure 236. Side grooves 276 are provided on the spacer 268 to maintain the nominal wall thickness of the component. The spacer 268 further defines a chamfered surface 278 positioned toward the front of the trunnion attachment structure 236 such that material flowing past the exterior of the bucket 202 may be deflected by the chamfered surface 278, thereby reducing wear on the trunnion attachment structure 236. The orientation of first miter wall 238 and the attachment of trunnion attachment structure 236 to the wall allows trunnion attachment structure 236 to be partially spaced from the material as the material flows through bucket 202 (see, e.g., fig. 3).

The bucket, trunnion attachment structure, etc. may be made of any suitable material including iron, gray cast iron, steel, etc. Also, the bucket, trunnion attachment structure, etc. may be integrally cast, forged, or may be made and assembled by fastening, welding, press fitting two or more pieces together, etc. to form the bucket, bucket assembly, or trunnion attachment structure.

Any of the size, ratio, angle or configuration of the bucket, trunnion attachment structure, etc. may be varied as needed or desired. Also, depending on the application, the size and ratio (including center of gravity) may be based on a bucket that is empty or has a payload. Thus, the given values and configurations shown may be given by way of example and without any limiting sense.

Industrial applicability

In practice, buckets, bucket assemblies, or trunnion attachment structures in accordance with the description, illustration, or discussion herein may be sold, purchased, manufactured, remanufactured, retrofitted, assembled, or otherwise obtained in an after-market or OEM environment.

For example, a trunnion attachment structure or a bucket may be used as a replacement. The bucket or bucket assembly may be used with a machine having a rigging subassembly 300, such as that shown in fig. 15 and 16. The rigging assembly 300 is shown without a lower brace but with an upper brace 302 applied. Upper brace 302 is in the same plane as hoist chain 304 and trunnion link 272, helping to avoid slewing of hoist chain 304 (which can result in increased stress in the chain). Moreover, the hoist chain 304 is spaced from the first inclined wall 228, thereby creating a gap 306 such that the hoist chain 304 does not rub against the upper edge 232 of the first inclined wall 228. Therefore, the lower stay is not necessary. Hoist chain 304 forms an angle with the vertical (when projected onto the X-Z plane along the Y axis, as defined in fig. 2-8) when the bucket is substantially horizontal, which may be 0 to 20 degrees, and in some embodiments may be about 10 degrees. Similarly, the angle 280 formed by the hoist chain when projected in the X direction onto the Y-Z plane may be 10 to 45 degrees from vertical (see FIG. 16). These angles will vary depending on the orientation of the dipper 202 in use. In some applications, the angle of attack or carry (bucket tilt), which is the angle the base member makes with a purely horizontal direction, may be 0 to 40 degrees.

The configuration of the bucket shown in the figures is shorter in the filling direction, allowing a more efficient filling and dumping method to be used when applying the bucket. Moreover, the balance of the bucket during filling and dumping is better than buckets previously known in the art. Further, assuming that the load is reduced due to the removal of the lower brace, the capacity of the bucket may be increased as compared to previous bucket designs.

It will be appreciated that the foregoing description provides examples of the disclosed components and techniques. However, it is contemplated that other embodiments of the invention may differ in detail from the foregoing examples. All references to the invention or examples thereof are intended to reference the particular example being discussed herein, and are more generally not intended to imply any limitation as to the scope of the invention. All language of distinction and disparagement with respect to certain features is intended to indicate a lack of preference for those features, and is not intended to exclude such from the scope of the invention entirely unless otherwise indicated.

Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein.

It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the apparatus and methods of assembly discussed herein without departing from the scope or spirit of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. For example, some devices may be constructed and operated differently, in an order different from that specifically mentioned, or in some cases simultaneously or in sub-steps, than certain steps of any method described herein and which may be omitted. Moreover, certain aspects or features of the embodiments may be altered or modified to create further embodiments and features and aspects of the embodiments may be added to or substituted for other features and aspects of other embodiments to provide yet further embodiments.

Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.

Claims

1. A dragline bucket comprising:

a base member extending along an X-axis, a first side member extending from the base member and including a first upper edge, a second side member extending from the base member in an opposite manner from the first side member so as to define a distance from the first side member to the second side member, and a back member extending from the base member and including a second upper edge;

wherein the first side member, second side member, and base member define a mouth for receiving material into the dipper; and

a first angled wall extending from the first side member and a second angled wall extending from the back member and intersecting the first angled wall, the first angled wall forming a first compound angle with the base member, the second angled wall forming a second compound angle with the base member different from the first compound angle, the first angled wall and the second angled wall forming an obtuse angle therebetween, wherein the first angled wall and the second angled wall are connected together and are each angled inwardly to overhang the base member.

2. The dragline bucket of claim 1 wherein the first inclined wall includes a third upper edge connected to the first upper edge of the first side member and the second inclined wall includes a fourth upper edge connected to the second upper edge of the rear member.

3. The dragline bucket of claim 2 wherein the first inclined wall is connected to the second inclined wall and the third upper edge of the first inclined wall is connected to the fourth upper edge of the second inclined wall.

4. The dragline bucket of claim 1 further comprising a trunnion attachment structure mounted below the first inclined wall and proximate the first side member.

5. The dragline bucket of claim 1 wherein the bucket defines a fill direction, a center of gravity, and a cartesian coordinate system including the X-axis, Y-axis, Z-axis, and an origin positioned at the center of gravity, wherein the X-axis is aligned with the fill direction of the bucket, the first compound angle includes a first component angle projected onto an X-Z plane along the Y-axis and a second component angle projected onto a Y-Z plane along the X-axis, and the first component angle is 50 to 85 degrees and the second component angle is 50 to 80 degrees.

6. The dragline bucket of claim 5 wherein the second compound angle comprises a third component angle projected onto the X-Z plane along the Y axis and a fourth component angle projected onto the Y-Z plane along the X axis, and the third component angle is 60-80 degrees and the fourth component angle is 50-85 degrees.

7. The dragline bucket of claim 4 wherein at least a portion of the rear member forms a third angle with the base member, wherein the bucket defines a fill direction, a center of gravity, and a Cartesian coordinate system including the X-axis, Y-axis, Z-axis, and an origin positioned at the center of gravity, wherein the X-axis is aligned with the fill direction of the bucket, and the third angle is projected along the Y-axis onto an X-Z plane and is 60 to 80 degrees.

8. The dragline bucket of claim 1 wherein the first and second inclined walls overhang the base member.

9. The dragline bucket of claim 1 further comprising:

a miter wall extending from and proximate to the first side member and forming an obtuse angle with the first side member; and

a trunnion attachment structure mounted on the miter wall, wherein the trunnion attachment structure includes a base plate; a shim extending from the base plate and defining a trunnion slot having a longitudinal axis parallel to the X-axis; a pin bore extending orthogonally to the trunnion slot; and a pin disposed in the pin hole.

10. The dragline bucket of claim 9 wherein the base plate of the trunnion attachment structure further comprises a chamfered surface forward of the trunnion slot.

11. The dragline bucket of claim 4 wherein the trunnion attachment structure includes a base plate; a shim extending from the base plate and defining a trunnion slot having a longitudinal axis parallel to the X-axis; a pin bore extending orthogonally to the trunnion slot; and a pin disposed in the pin hole.

12. A dragline bucket comprising:

a first angled wall extending from the first side member, a second angled wall extending from the rear member and intersecting the first angled wall, and a first miter wall extending from the first side member below the first angled wall and between the first angled wall and the base member, the first angled wall forming a first compound angle with the base member and the second angled wall forming a second compound angle with the base member different than the first compound angle, wherein the first angled wall overhangs the base member and the first miter wall angles outward and away from the base member.